I'm not making comments about my own system, because I built the entire setup for under a $100. I have heard quite a few others though.
I listened to the Cerwin Vega subs in a local shop at one point, and wasn't very impressed. They would probably do well against a Type R sealed, but I think an R would win out ported no questions asked. I haven't seen a lot of good stuff from Cerwin Vega, though the older stuff they had is great, I have a pair of older coaxials that I used which sound very nice with everything considered.
Polk Audio, I'll admit my experience is lacking with them, but I haven't heard great reviews of them from some that I know, that are using them.
Kenwood HU, I'm an alpine fan myself, but there is absolutely nothing wrong with kenwood, either. That's just user preference. Both are great options.
The alpine amplifier, well, I'm less impressed with their amps, not that they aren't good, but they weren't outstanding to me. I don't think it's worth the price to step it up. I'd go with a Diamond Audio amp, perhaps, or an Arc Audio, if I wanted some quality.
http://www.woofersetc.com/p6856/FD-2200--ARC-Audio-2-Channel-370-Watt-Amplifier.htm
But hey, this is all opinions, so I'll stop cluttering his thread and go off elsewhere.